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Full Description
Compares currently used methods in determining concrete toughness and presents recommended test procedures with theories and models for describing cracking and fracturing phenomena. Effects of loading rate, temperature and humidity are also examined. Well referenced and illustrated, this book is filled with practical technical information for materials and structural engineers.
Contents
Preface. RILEM technical committee 89-FMT. Subcommittees. Notched beam test: mode I fracture toughness. Introduction. Summary and recommendation. Proposal 1: Two parameter model (TPM). Proposal 2: Size Effect Law (SEL). Proposal 3: Effective Crack Model (ECM). Comparison of ECM and TPM. Application of proposed fracture models to large structures. Acknowledgement. References. Appendices (Test data, Proposal 1 and ECM). Fracture properties of concrete as determined by means of wedge splitting tests and tapered double cantilever beam tests. Introduction. Description of experiments. Experimental results. Determination of Gf-values and tensile softening diagrams. Evaluation of fracture toughness Kic by the compliance method. Mode I fracture parameters. Conclusions and recommendations. References. Mixed-mode crack propagation in concrete. Introduction. Mixed-mode fracture criteria. Test specimen geometries. Fracture of concrete in compression. Conclusions. References. Appendix (Round robin). Loading rate, temperature and humidity effects. Loading rate effects. Temperature and moisture influence. References. Fracture process zone detection. Introduction. Compliance measurements. X-ray techniques. Optical microscopy. Scanning electron microscopy. Electric resistance strain gauge techniques. Photoelastic methods. Mercury penetration measurements. Dye penetrants. Infrared vibrothermography. Ultrasonic pulse velocity. Demec gauges. Acoustic emission. Interferometry techniques. Multi-cutting techniques. Numerical methods. Conclusions. Acknowledgements. References. Laser interferometry methods. Holographic interferometry. Speckle photography. Speckle interferometry. References. Indices.
